Yep, I'm with you on that, too. My biggest gripe with Borderlands was that it seemed like there were under ten real kinds of monsters that weren't bosses that you'd fight, and then maybe double that in terms of variants. From what I saw. Fallout 3 was more varied, but even that kind of bugged me a bit in how few things there were. I really like the amount of variety in a game like Zelda (any of the ones since Link to the Past, really).
At any rate, my goal is to have all of the monsters level up, of course, but also to have a ton of different kinds of monsters. And, as with ships in AI War, that's something we'll be adding over time post-1.0, too, I'm sure. Free DLC and paid expansions, there.